Nah almost certainly the reason is that hydrogen cars can function similar to current cars so while there might a change in the infrastructure it shouldn't be too hard because natural gas cars already exist. This is basicaly trying to succeed with the least amount of effort required. Conservative businesses love that.

EVs on the other hand require a completely radically different infrastructure and business model with regards to batteries, swapping, warranty etcs.

Japanese business are weird in that while some companies are very high tech innovative the business practices tend to be very hard to change because of the culture.